[TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted HOT
- From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 18 Oct 2005 07:09:32 -0500
Let's go back to some basics, but first clear something for me:
The PW vipur board was, supposedly, only used in the ctc130c chassis,
and I can not find your model number anywhere (it's probably with my
training manual). I see an FMR623 that is a ctc130a chassis.
Does your variation have a separate power supply board using U2 to drive Q1?
Are you working with or without a schematic?
I think the burp at unplug is normal.
The "goldenrod" says pulsing is an over current shutdown condition for
the "C" variation.
Do you have any Horizontal pulses?
As for Q601 and vicinity, I have highlighted R667, 100k 1/8w resistor,
but no info added.
Q601 is an on/off transistor, and should not pulse. U601p18 is 5v for
the chip.
There is a 6 pin plug, H602. Pin 6 is 11v standby from the chassis and
is the main supply.
Same plug, the blue wire should be pin 3, you need 90v pulses to develop
the run supply.
I have a heavy service call schedule today.
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
David Lessard wrote:
> Gentlemen, I am truly confused! I've checked all tips mentioned by
> you wonderful guys, tips that have obviously been around for awhile
> as this chassis is 25 years old. I still can not find the problem.
> This TV cycles ON/OFF about every 3-5 seconds once the "PWR" on
> button is pressed. I'm missing some of the schematic Max sent over,
> the part that contains information about Q601. I need to study this
> part of the circuit a bit more to confirm what may be going on here.
> When I press the "PWR" on button I see minimal activity at the base
> of Q601. Where does the signal come from that drives this transistor,
> perhaps the mystery lies here. Thanks for all the tips and advice, if
> anyone has information about Q601 please send it along. Of course any
> other tips would be greatly appreciated. BTW I don't normally spend
> this much time of a TV, its become a learning thing at this point.
> David Lessard. Alexandria, Ontario, mr_fixit@xxxxxxxxxxxx
>
> ----- Original Message ----- From: "John Conti" <contitv@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx> Sent: Friday, October 14, 2005 5:14
> PM Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER -
> CTC130A - Dead - Shorted HOT
>
>
>
>> David, just a few things to check,c115 (68uf) check r 115(36k)
>> cr105,cr408....also check r16 (1.5 ohm)p/n 175331 in the drain
>> terminal of Q1 VIR out for increase in value. This is a critical
>> resistor. also c7 (68uf) c11 (150uf) can cause this problem. And c
>> 108 (.22uf) Hope this might help. Also if that does't help check
>> all solder connections on the mtt001 or 002 module.
>>
>> John Conti,sTV Texas
>>
>>
>>> From: "David Lessard" <mr_fixit@xxxxxxxxxxxx> Reply-To:
>>> techassist@xxxxxxxxxxxxx To: <techassist@xxxxxxxxxxxxx> Subject:
>>> [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A -
>>> Dead - Shorted HOT Date: Fri, 14 Oct 2005 15:24:09 -0400
>>>
>>> Follow-up:
>>>
>>> Replaced HOT, and R426 horizontal drive +B, resistor value was up
>>> by 800ohms. TV pulses ON/OFF when ON" button is pressed, TV comes
>>> on for a brief second as power cord is unplugged. I've replaced
>>> C672, C654 and
>
> C656.
>
>>> When I disconnect RED wire on standup board next to VIPUR TV
>>> pulses
>
> ON/OFF.
>
>>> What am I missing? What are the start conditions for this chassis
>>> to fire-up? I know nothing about this 25 year old chassis. Thanks
>>> in
>
> advance.
>
>>> David Lessard, Alexandria, Ontario. mr_fixit@xxxxxxxxxxxx
>>>
>>> ----- Original Message ----- From: "Phil Bader"
>>> <tjanphyl@xxxxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent:
>>> Monday, October 03, 2005 9:57 PM Subject: [TechAssist] Re:
>>> [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted
>>> HOT
>>>
>>>
>>>
>>>> Yes. Dead,5A fuse blown. Fix: Shorted cap C425 (043uf@200V)
>>>> yoke return I
>>>
>>> think.
>>>
>>>> After you get it on, here's some issues you may face:
>>>> Brightness a bit exessive,retrace: C122 (30uf@250V) front of
>>>> flyback. Raster narrow at sides, slight bow: Q1 on pincushion
>>>> upright board
>
> near
>
>>>> rear of chassis. RCA#146847/2N2222A,checks OK-replace it.
>>>> Channels 2-6OK, no 7-13. Open and resolder all stakes inside
>>>> the
>
> MTT001
>
>>>> module. Bands of interference (two) slowely moving up thru
>>>> picture.: Inside
>
> the
>
>>>> MTT001A, change
>>>> C654(100uf/16v),C672(220uf/25V),C656(330uf/10V). Immediate shut
>>>> down at turn on:Flyback bad. Vert. retrace at top inch of
>>>> screen.All assoc. caps seem to ESR OK. R506(6800ohm/2W) runs
>>>> hot normally.Remove,scrape leads and resolder. Left side
>>>> jailbars: Workaround: Add a 10uf/250V cap across CRT's PC
>>>> board's stakes, pos. to "C6", neg to "Z1".(saves pulling
>>>> chassis) Excess brightness: C122 (47uf@250) Unusual brightness
>>>> issue: Increase brightness with control,all sudden
>
> at
>
>>>> max: R721 (680ohm) increased to 690ohm. Also: Q703 shorts
>>>> (#143806/NTE159).HTH. Phil
>>>>
>>>> Philip Bader Jan Phyl TV Inc. (estab. 1976) 3420 Recker Hwy.
>>>> Winter Haven, Fl. 33880 Fax (863) 299-8821 email:
>>>> tjanphyl@xxxxxxxxxxxxxxx personal/ alt. email:
>>>> pbader@xxxxxxxxxxxxxxx see our ad at:
>>>>
>>
>> http://jan-phyl-television-pc-monitor-service.9601288257006.worldpages-ads.
>>
>
> c
>
>>> om/
>>>
>>>>
>>>>
>>>> David Lessard wrote:
>>>>
>>>>
>>>>> This TV has a shorted HOT (C1308K), main fuse is blown. Are
>>>>> there any
>>>
>>> common problems besides a bad flyback which could cause this?
>>>
>>>>> Thanks in advance, David Lessard Alexandria, Ontario, Canada
>>>>> mr_fixit@xxxxxxxxxxxx
>>>>
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